SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd43f8e0347c817de53c9bdbbac05fe5fe6587eff3860ea6bf3b2fba97215bf31' 
  AND token = 'pI8TRmqZsJaI7lV6DMt5qBzjsXen6C9sZj/9l1DpuJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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