SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f022b80a42c0b2bc7716042585214bfd4fa79e686d351cd90aba752e1bb75432' 
  AND token = 'wKpCM32X8KtXIzHFBCyH+2kFWnv0PG6l64jJhDAzcko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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