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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e6bdf030596c53cdbf7f1ee98dc0857a115476d2b7b1f7917c7676fcfaca38' 
  AND token = 'OyGTZMpK5hgtJjN1reiWzA4JAzYiCOSSmKPFgIEyX9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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