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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54d5edb3fc950ad8e4294278d549a7ec1bfc97943e404dcb5abce6d203b9c15b' 
  AND token = 'UIq+Ly8C43hbuQO3UZW5CmRiXqpeMJ0hWfjdt+aQEKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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