SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f272109385c3280c1a97faca2a8867a1789e36497863cf33326d7045951029f' 
  AND token = 'Rxvj4MOlExv9YJTVHPgoNfnKFQ6ICRzf9dYi2B1T+ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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