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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9039253db3c482ed67fa374b017f4324a0f21d3c196776594cf9feba1daa7c9' 
  AND token = 'bL4DXdj/fpRCSN91PNG637lPJlK7YlOunJDzv1EM0GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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