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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc33999c43fd03ddec404d5c21ef9069c18066cbd92132013b038a7e0bf4e18' 
  AND token = 'tQNYyrb7tJx8SIJSrYy5nV74umpy+vwtyFykzb+iOd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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