SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08feed483765f8352c6726330e8334e7e94d84822fca69987bba61b2a60e46be' 
  AND token = 'ruzqwXRQqMbdj6pAJDcsBqOKmprx+Rgfo15eV/bJ7yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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