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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950f93ff2aa01a0eb1f7751ec62aa5fd7b78fb0ba8772a50619a9482d4f13068' 
  AND token = 'IKjbcAjXypMYhFNHiCYvQhPjwCxVQ4O8n8RaIx4WsW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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