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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '435d9aa5f8b109217ec9b5a0cf692a33477692000903f23a6805014e236b6f8c' 
  AND token = 'mkmOHn0h43OL4BDHdPuQEYBP83ARTMHlIT7P9y5bu20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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