Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a1d3728e70661f2c99240529229b0edeaa769849b5a22a05d32bf51a5ea5b8' 
  AND token = 'tiJ5klPPEMvlXES+yhQHfFnBTWK1oRagjnqz0n55/oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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