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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ea6551cd853b2af3f484d6a8952724c35f331a16a57c6f610d983b5a28230c' 
  AND token = '9dbdie0TATYZlkTzFWOu3V4m56/qrBQQRlFjFaydubc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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