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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68bf74cef567d1b39588c705bc61195abf1f83ec8ac43bb29c829a97fd721b04' 
  AND token = '2LdhNlcylzyH3TgYdrAajqPDvzxnZy9/9/P73ckMS6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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