SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd61f22215f5e5f68714b5a1325ff01316ca738d7a7b8141b591321492b6809e' 
  AND token = 'Y0MKgebftq5FCYfae+edMKN4ct4e8rR+YtDiP8phnFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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