SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bbdb4128a47ed259b15c544ee6b64466e7dfa05c7de7b02d9f25ee9338ec08a' 
  AND token = '+RkdWjLzRMgAsfBKCQDr3o75YOZYfl8ozNNciG1zDXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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