SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebe3da17621aaf8dc8b430a75b69fead4dca0cb839211903efa723748512795' 
  AND token = 'hwRJXKYqet7sRnjP4ZnB2pAFhNz5VZ1kpYQyXo1Wy9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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