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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236dd65313d7e759de149788314f7d9018fd76b3f9ca346632400cabcc445c55' 
  AND token = 'UIexCb/dZgIepZljo7dby0laSEdJcwJKSwaqgZQHLm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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