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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f5f9f1cf27e2d21f60f5dad3997039169023909a76cd5162127a129a36e903' 
  AND token = 'WTV9T+2IJ+u5P2P9S68Ud5C7U8dZGZrvtofORlIjGTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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