SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3810eb5f4c3842b6adec16a8a570f363f73f0771c99c4f2346b3eb7c342cd9b2' 
  AND token = 'ZyuPvZ7zU/PMyqp0TK5olnt/ocrySY8ROG9mlJsjylk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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