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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59effb9e004432f68554e2db3d09834454fd93ca5ecf73a245b6ce9b7523b2d8' 
  AND token = 'ZXB3cX/XRJUEbhQnk/lwwb8TtuW+B/4584pl/PXoiMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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