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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc989ea194662184a705175b42cf211ea9daf4a17a4f53cd8be0be955e1a8e2c' 
  AND token = 'WXgQG+G+eAvamo9W1p90uYiA2yeqDwEWMyLaoS/Z0ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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