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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a483d6f4bbd07f2b7a84f4b13c1391332b2f0c3d0e9cc7d01be13cc394565706' 
  AND token = 'xUxnAvFsqXtHkxD0EfElFLQy/yMKIz02dF4eXwFqAKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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