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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513a8ce647e8f94b8bb3689167495a535df9bb731c63d79c54eae6ba542e54c1' 
  AND token = 'M4x3FULRyb756fqAcnU/5PVSGeD5HB6mu6YiYyLnkpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}