SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6314c0700f7ea8b6a0dbd2cbfd1af073fa55ac623c2169975b19f4819816148b' 
  AND token = 'witns+Gkrqv4CSXzLoB2MsAxJdByKp2DANOPB5GzY6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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