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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d717a2967f1f6190f8d15f764b7859e41e55c651cc033d02897e6ee2e753f04' 
  AND token = 'R9VY3kv7+5fj4xBTU03XeqoIf9NEELO8evkIlHTUZ/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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