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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a02dc4fb11f21c2a54b4b4eff3a01d9ee6d045276b606441c37a183d56c42f' 
  AND token = 'fPVC+sKhCp/oMp17obhJti5IJ7U08y2i0fStjHq1XmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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