SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f1192aef4c4c07bb50cd366f9413d8635eb1920d56d8fa3cf9c52cd53dc701' 
  AND token = 'pt4Hv2qjtPGBIoSzM4vQnloq5LX/rCPWikRzT+bFzEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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