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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8852de8338322708cda6f8e6f276916f440b846e5fb4ec96efa46d0fc73984b7' 
  AND token = 'v7t82LwlaTdRJ2Mxn8DVZMBm+nrh0Kps6oJw+EoeBuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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