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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b3c719f7e0f1ca36e4a746a6a372aa441f847e3675a26e9142ccaaa9737cf7' 
  AND token = '2NJcU8R7UpYSINhS0jbSeyfGTw34IigHutgGbTJObm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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