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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '441045684cb02aecfe25ed8e208eedd4aea4c3824aae247273e9d4df49d7ebe3' 
  AND token = 'f3E9+CLcBDE/+acP1rgi2RzZnbofW0iRtYzEnJIGVTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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