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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791f5386b60d34030b638a01bbb6fcdf4b7bfe8588d49ad0ba25bbff12b8b898' 
  AND token = 'WashkQaTzmoIgow737SzUgOWI0YtGuQBYOZjUeMBucI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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