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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810555c5b8677cdd9b31219218405ccf0d1ee3ef49ea7c2fb9f8362002a72244' 
  AND token = 'aWszCdWEjV82dt/QGI3jqo2bcFbK20Fksxhwo9W4/3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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