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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9f89899fed449a1703ac1e8f0476d821c1796c6d0cc1a09a88c281e03796f1' 
  AND token = 'XXRi+tbtcOwrCPY6TwCpKEkv5sijLstbVJGohJbAe2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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