SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80ae50b8f3cc95d882026f0f9454ce0fd71645845a89614567991d7704e0a368' 
  AND token = 'XFpz+vjxhWEJgo4e/FQPTwQrXMah5At/zb4EVaTYR2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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