Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6e1dca88df46bd5a45cb4d0a5d5cf84a48d2b1a852b04efe6ab03b8835c26f' 
  AND token = '1An6WouHqdCQQ2VhGXswtHEofcFgDLvpIFX6Rd+OdKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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