SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0011760b1ab5f1b9a9f88d2eb966d81413e3ac25b5d19e978ebb82d5cc66e997' 
  AND token = '6TzIhCWVt+Q7jswQJYRfLV4ZVSQMgfK9V7XY2B5B3DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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