SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca60c0325398cc460a8a56063b858c8108dffd1df44eeb8447c48bba9be8153e' 
  AND token = '5YRhoZkwY1xYonKcepG15CthJpr544sdCwGXpo5V1gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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