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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c147f30d45d7f63cd121e4b7b9f81ff036e334558e3914790aa42e02f92778a4' 
  AND token = 'HQcZ2BrvYA8n3RqgEaUc0aSg1xNryQiV4oqbQZrV8vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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