SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba6096a5bfe94999dec74c188f751d638da4866f8ece19af1c2591e2e30da63' 
  AND token = '0l6TqGm5j/jx2B4ofYhHHTgA6lqUWRIIHvE52EjrDzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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