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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c76796a43e8656ef2595b86340b94fd42c6f7b97ad9b6909c58975de112bda5' 
  AND token = 'AZkxwtibIdSAbCHNnIDzeOem3mlCE7oX51Uvosem4Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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