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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e31b621c6f795d9797d4787dd5f7712db6a695f81ac5d4a89ae4a46d2fd35ec' 
  AND token = 'gU+CRIWUOCRjSTEXdseEi5n8IAvEY/ssftGO9WNpdes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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