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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f204ebb6472c5f3c082f586ac71507dbbf3b0f02d08e90ea7630daf42f64d63f' 
  AND token = 'w8UkiG5cLOs2O+Q7IHBm3NjyoNEjXAmAmZGjuhCCjFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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