SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f439b8e3b7325dd6d452fa069ef08c9a504db6a8030f7a8b903e4acb96a505' 
  AND token = 'kKXL9qsUfc7vdSbNAqHg5zip55wYZqkL/n2wy+GZKgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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