SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362b73d13320274b0d7969242d82f9fc07699fc5d8d69cf7bfb8ad3ba207ae07' 
  AND token = 'js0Ey3F6jXsrJwGKJs6ipJHqP+HJQzVF6Axa/VZQNzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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