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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18a65920f87bfe8e1277ee40f0d3468f778e0d87eefa40ce07c20517e6be7892' 
  AND token = 'QAbsAZtNAnju1ZaY5J+0Yq6zQTt7w8GJIyun02Mv3ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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