SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ada14227786bb9aab04fdde5268e407d9d55fd0568449fb443bd69fb93cd35' 
  AND token = 'wZHJIicb2gan+8gpD2RGIF6jcHVMn/qAg6YBnb/OFH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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