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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ce7473ddd8ee481eedfc7e58544b3f7050312ab5edd7db8070c2812f714dfb7' 
  AND token = 'UPPGhXEZ3MBjntDvER6Ye1m10f6/yrDx5a+4jr1b8Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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