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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d23a3fb2ef8b34ca128edd1a468653ed7e6f7d0d49b166eedc51c1ebbb0aade' 
  AND token = 'XhZoWbzRC8RpOYKjL5rTNNCT0hM+dcASL7fA5cTgIkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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