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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84082e63c8f08ebdd6e8e605127b0782aa182bf20bb7a72769341bf0ee2304ae' 
  AND token = 'mgg37IKYvzy7xJNa2+002o5Re4YtLvpT0YDFQQEtwrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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