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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33ab33112c9313cdb67a5bd1433d6190b0f410aa3f1dca7c825fb15bf0d95f5' 
  AND token = '/kX5m+3dMr629t/AjPgcGt/JtF9edznLrOOoTL7tZBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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