SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc72e9f1509f1cbb9871cd93cd7ab109e22fa8a36c4060a6790c4d69b1676f5a' 
  AND token = 'k+FtHZmJQjYk232QOwog8VDpLQHBlojunKbn++qhS1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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