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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ca12c5f47ebfb9ec3250bd73e77aa24cb2ffb7563c5b023eeecd66bedf239a' 
  AND token = 'JhksJY1KBjcONEnak+67tYqLxGyQ7D/p/mG1FLmZiX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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