SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '081a0ae3914449fdd010aee72b579ee393c094c23517e078fb4f553a8d71b576' 
  AND token = 'xZxuDgsu/HpHDFjhvRIT6Calsicc5qvYbBGx4ORbXUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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