Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3183c1c71164dccd4cd06fb707da5c51c0e9ba5c21142274d37703babcc7de97' 
  AND token = '+wrkgJmojbCi2177S0GPbFPJyqoDa0t1LtnYVwBTJc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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