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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c79c54cbc5e0ed310b10d9cc5a1f98c481146b8ba3a9e34ed911de24c8f779' 
  AND token = 'LbjOfFF8fSGtizDRzxXbd2oh7aTXZd1Z9gDQkvUCRK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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