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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e8844c7a649587e7139caddea873c00d87d83ace0d76d87f9f458e7928ef3c' 
  AND token = 'N8xSsLvXvvGDM0p1E5nQYXb/TbmLUWYUUMqYmEqvGJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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