SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95fffec4ea947eb16b4be9dbb4de966cc90311a52f94c8c8b83d21e7f87a5983' 
  AND token = 'JE8gTM3qPtnoiPz1guxTw1aHDYh9O5ALoG/6JM8GizE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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