SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ebe8a4355258abc026645ad9ceea77d684f9667739d62832543634d24f3413f' 
  AND token = 'FFweosyWgCgYaURbvvMqb8L2ZVG/uYq6Aa7PZ4QSCJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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