SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f3d5e57955cef38656ed66e875fbda7b1cb348f07eb7ed568449bd134297e57' 
  AND token = 'Twn+rgO/m+LBzlL5iM3PHq9d/4HAx+0YSYKEPIrBUSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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