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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e56eddc180060dee23a80f9476d9622141c5a42248b31ecbc29f98713b83c7f6' 
  AND token = 'pxNG2TSwAn0a3cImTlzTW5v64PZvogTzw95o69di9Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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