SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f412b36341705c314793c19aacda5c95fd223f729666bb28aa9d1b4896000699' 
  AND token = '3YOjMxgWheyQu2Xgs5AvHAkYB8+arcLq7HYmiIz/pIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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