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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69df361f17f38457805dd6f5d25efd949a906838017d21fdcd729e860fb40fb0' 
  AND token = 'WH3ZMGdlBeUr5zAOC24V4VXSr8RG61QCaovpN5tpARU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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