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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d059c8834af94f1b7ba91694a6c8214f3ebe98a2003d3ab3299f53d25d44ba6' 
  AND token = 'UGshAK19SZk1coxL5mOWyLSWuUTP2BwROrNbk2IIUlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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