Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e948133f79ea65324ec0826eb4e21cd198715923e782a9e4b95d86921ac7d0bf' 
  AND token = 'k9eVmktbJrweN0K83IG7apBROF7GTMsY6kxC2IKNqY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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