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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf77154c56713745f9f692f7cd23a70b067730c675816c982e674784b5989a3' 
  AND token = 'bLmT6W5aJSFfbFO7S5b85oWSwNYw6uHgtvTGvbmyEB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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