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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e542ec5b96b9ba09979b181e0e24b4892dfc8746f794261a9ff73063f81ef96' 
  AND token = '2MSGXriQT2k7tSYQCCJDlA7qj8jzSsy7mw5o7o++DyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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