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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bd28c4f06cfea13a3049b6c403f7e7203ca2165fb08bffbd127c7bffec9b643' 
  AND token = 'UoHi80yu/Ku8YubLoBcG55iB2ef9B1iXM69+DvvJrOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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