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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07bc64cec2ee20fe4b89d8b76c3eedef5782760e6d4d1f9aed9f4285d7e1b84' 
  AND token = '4E/JoneFK/YkrF9Ou+cxb4kmUUl2VHUTstHcP7nHDBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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