SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db975792334d72048663cb7bda43e242737dff693ee8fe2704ec17c06594c34' 
  AND token = 'K9RRHfg5oT79WzzML8aJ86VqOnS9i/YUJgYKHJFNDZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00200

JSON explain

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