SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177d516edc0c0ce543a5e523f94e11264b99112e6daf960bb6190fac6a806bd1' 
  AND token = '3xxkKJnwPphKXsm3EqCbe9vtPZk88Brip/RIh+oiluQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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