SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41bb810ad7d9b26b73b2521a9266503aacfb249a5d2c5f47c58c6164354844ec' 
  AND token = 'FJAhdcoKpKUHSeb9zqV1gA06Z4lI/HQ7VCI67W02fDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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