SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ebd221e1fc9446ae84bb9997b2accd34e30dcb71c1cf9f55e602806c63c2502' 
  AND token = '0XA09lwOFaZOz/vw+/vv+GKKLuWWpL2ZKy/91zfJHbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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