SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699a5697cf186e9c44e26efb45ac0b21643a7941667d5fdb33d77ff36f374b7b' 
  AND token = 'l3t/dEPUUBqsCmwIl0GJ5qtdRuvto6w984hVFK2Yvr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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