SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e26b44014acc8357928de17bea81310d266d1b24f9da92bc60361562af8b4e' 
  AND token = 'XcHpDF8BH1RYWlTluPAM9PTeNQX/xf+UhJxBoGvniWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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