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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79140649f3b849941dead4ea22ce40d214ff875aab52731257f105dd11e634a' 
  AND token = 'TJ/qwW5N3hc6HfQBe+7wYj7DmCj+sI7BW8ATJxJHOMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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