Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6fc245480b114344f8dcf70f8970c1937888ffbe97ee3056e39b0033e04902' 
  AND token = 'r3WhUr2vK9t5QFNdDQOqvNjgLdf2AP3RLl6iBEf0QFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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