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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8adb21c1d48a4a88b8bab2125cb080c7e65ddb096828b47a9644197cd28ab1' 
  AND token = 'yLh7AixXAqRxrPE8SGz7LcULfaAJbUmn8/XaUTZ7nuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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