SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29721fd2c3976aef298f6811335ac27f21f4951d964c3e5da39e9b5572faa04f' 
  AND token = 'na5Q5j/0sfV+QuMiEakPyjUhIyO56gPWx/ZVPBHq2wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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