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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43559be4b8fcc4806edc11d91d212113247802d20eed128318175baa012cc1b4' 
  AND token = 'l48eZs+XY5mV5osi/3efpAunQIZo8Z4Nis0Fj9baiPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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