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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3098eb8e40585433dd2af06a089036211ed6f74b7a6ac162612d1b88a8a16fab' 
  AND token = 'QsrXpxKQ/0NkXt+Ah0mZ/4N2H+g49fr8EfxAQZt0pqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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