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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b61be3bdc3b5b0ee84422ed579c0bf268657c828b416abb84bd4ae8f164f55' 
  AND token = 'D7jzA4puh93JFo3ehpTTFllORIBwrNJ9BeWrGPClZoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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