Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b48fce58c8a5dac37c986ee9e361701d35f99c755154ed1bb34c6de6f7c2a4a3' 
  AND token = 'GV8Mf77f9AAz7lLCAFUO4nB3ZEKukMgP28qrlhM203U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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